N_RADIAL > 1 with ZF_TEST_MODE

[jcandy]

@kdu7529

I have updated CGYRO to run the ZF test (ZF_TEST_MODE=1) for N_RADIAL > 1. When N_RADIAL=1, a single kx is run and RH diagnostics are printed. If N_RADIAL > 1, then there are fewer diagnostics but all values of kx are printed. Note that only positive kx values are simulated:

kx = 2*pi/L * (1,2,...,N_RADIAL)